代码编辑器：
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<meta charset="utf-8"><link href="/static/next/css/tryit.css?v=2017082407" rel="stylesheet"/> 3
<style>4
.button {5
display: inline-block;6
padding: 15px 25px;7
font-size: 24px;8
cursor: pointer;9
text-align: center; 10
text-decoration: none;11
outline: none;12
color: #fff;13
background-color: #4CAF50;14
border: none;15
border-radius: 15px;16
box-shadow: 0 9px #999;17
}18
.button:hover {background-color: #3e8e41}